Organic Mosquito Repellent Method.

^This.

If nothing else, consider how pesky mosquitoes are and how simple your proposed solution is. If it were that easy to come up with an all-natural herbal mosquito repellent, someone else would have started selling something like that long ago. On the bright side, even if it doesn't work, you'll be the best smelling guy in the woods!

And if do you come up with an all-natural repellent that actually works, you need to head straight to the patent office.

I'm literally LOL'ing at the notion that Adirondack bugs would be thwarted by some herbs*. All they'll do is give you a distinctive flavor.

There is one tried-and-true solution... DEET... 100%-strength if you have it. I'd even suggest using a marker to make the middle "0" into an "8" to make it even stronger (a la Spinal Tap).

Even if they were effective, I don't think a sachet bag would work because the cone-of-influence will be too small.

*That said, there is an organic product I've used successfully when the bugs are already relatively subdued... Bye-Bye-Blackfly. It's an essential oil-infused wax-based product that you wipe on your skin. Made in Saranac Lake. allnaturalrepellent.com/prd_byebye.html 
The product made by Bear Mountain under the same name is not the same product. 

www.webmd.com/vitamins/ai/ingredientmono-480/pennyroyal#

You might want to check the side effects tab.

We’ve used Lemon Eucalyptus oil bottled by Repel for several years and it sure works for our mosquito and gnat problem. I read a study that did rate it close to Deet in performance but it also had how often you needed to reapply and that is where Deet did better. You have to reapply Lemon Eucalyptus more often. This very definitely works in our case. I always keep a small nalgene of this in my hiking kit. Even gnats that don’t bite can make a breakfast or lunch stop miserable but this will drive them off immediately though we do have to reapply it every so often.

They have an interesting chart and no at this site;

www.npr.org/sections/goatsandsoda/2018/06/30/623865454/a-guide-to-mosquito-repellents-from-deet-to-gin-and-tonic

“Then there is oil of lemon eucalyptus, or PMD, a natural oil extracted from the leaves and twigs of the lemon-scented gum eucalyptus plant, also recommended by the CDC. PMD is the ingredient in the oil that makes it repellent to insects. NMSU researchers found that a product containing oil of lemon eucalyptus was about as effective and as long lasting as products containing DEET.”